U.S. patent number 4,987,992 [Application Number 07/294,349] was granted by the patent office on 1991-01-29 for material transfer apparatus.
This patent grant is currently assigned to Pflow Industries Inc.. Invention is credited to Robert H. Pfleger.
United States Patent |
4,987,992 |
Pfleger |
January 29, 1991 |
**Please see images for:
( Certificate of Correction ) ** |
Material transfer apparatus
Abstract
A material transfer apparatus for transferring articles between
different vertical levels. The apparatus includes a pair of endless
members, such as chains, mounted for travel in parallel generally
rectangular paths, each including an upward vertical run, an upper
horizontal run, a downward vertical run and a lower horizontal run.
At least one carrier is mounted on the chains for free rotation
about a horizontal axis and the carrier has a article supporting
surface extending horizontally in cantilevered relation from the
axis. Articles to be transferred are fed into the path of travel of
the carrier by a first conveyer as the carrier moves in the upward
vertical run and are elevated from the first conveyer and
subsequently lowered by the carrier onto a second discharge
conveyer for discharge as the carrier travels in the downward
vertical run. Guide members on the carrier engage fixed guide
tracks on the supporting structure to maintain the supporting
surface in a horizontal attitude as the carrier moves in its path
of travel.
Inventors: |
Pfleger; Robert H. (Milwaukee,
WI) |
Assignee: |
Pflow Industries Inc.
(Milwaukee, WI)
|
Family
ID: |
23133029 |
Appl.
No.: |
07/294,349 |
Filed: |
January 9, 1989 |
Current U.S.
Class: |
198/475.1;
198/800; D34/28; D34/29 |
Current CPC
Class: |
B65G
17/18 (20130101); B65G 47/57 (20130101); B65G
2201/02 (20130101) |
Current International
Class: |
B65G
17/16 (20060101); B65G 17/18 (20060101); B65G
47/57 (20060101); B65G 47/56 (20060101); B65G
047/53 () |
Field of
Search: |
;198/475.1,800 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
Primary Examiner: Skaggs; H. Grant
Assistant Examiner: Bidwell; James R.
Attorney, Agent or Firm: Andrus, Sceales, Starke &
Sawall
Claims
I claim:
1. A material transfer apparatus, comprising a supporting
structure, a pair of flexible drive members mounted to move in
parallel paths of travel, at least one carrier having a supporting
surface to support an article to be transferred, means for
journaling opposed ends of the carrier on said drive members for
free rotation about a horizontal axis, said supporting surface
being cantilevered outwardly from said axis, operating means for
driving the drive members and corresponding moving said carrier in
a path of movement including a generally upward run and a generally
downward run, guide means on the supporting structure and disposed
to be engaged by the carrier as the carrier moves in its path of
movement, said guide means being constructed and arranged to
maintain the supporting surface in a generally horizontal attitude
as said carrier moves in said path of movement, feeding means for
feeding an article onto said supporting surface as said carrier
moves in the upward run, discharge means for discharging the
article from the supporting surface as the carrier moves in the
downward run, said discharge means comprising a pair of discharge
conveyors disposed at different vertical levels, said discharge
conveyor comprising a main conveyor section and a second conveyor
section pivotally connected to said main section, each second
conveyor section being movable from a first position where it is
disposed in the path of travel of said carrier as the carrier moves
in said downward run to a second position where said second
conveyor section is out of said path of travel, and means for
selectively moving each second conveyor section from the first to
the second position.
2. A material transfer apparatus, comprising a supporting
structure, a pair of flexible drive members mounted to move in
parallel paths of travel, at least one carrier having a supporting
surface to support an article to be transferred, means for
journalling opposed ends of the carrier on said drive members for
free rotation about a horizontal axis, said supporting surface
being cantilevered outwardly from said axis, operating means for
driving the drive members and corresponding moving said carrier in
a path of movement including a generally upward run and a generally
downward run, guide means on the supporting structure and disposed
to be engaged by the carrier as the carrier moves in its path of
movement, said guide means being constructed and arranged to
maintain the supporting surface in a generally horizontal attitude
as said carrier moves in said path of movement, feeding means for
feeding an article onto said supporting surface as said carrier
moves in the upward run, discharge means for discharging the
article from the supporting surface as the carrier moves in the
downward run, said discharge means comprising a pair of conveyors
disposed at different vertical levels, each conveyor comprising a
main conveyor section and a second conveyor section mounted for
pivotal movement with respect to said main section from an
operative position where said second section forms an extension to
said main section and a generally pendant position, said second
sections when in the operative position being disposed in the path
of travel of said carrier as it moves in its downward run whereby
said article will be deposited on said extended second section.
3. A material transfer apparatus, comprising a supporting
structure, a pair of flexible drive members mounted to move in
parallel paths of travel, at least one carrier having a supporting
surface to support an article to be transferred, journaling means
for journaling opposed ends of the carrier on said drive members
for free rotation about a horizontal axis, said supporting surface
being cantilevered outwardly from said axis, operating means for
driving the drive members and correspondingly moving said carrier
in a path of movement, a first guide member on the carriage and
vertically offset from said horizontal axis, first guide means on
the supporting structure and disposed to be engaged by said guide
member as said carriage moves in said path of movement, and second
guide means on the supporting structure and disposed to be engaged
by the portions of said flexible drive members engaged with said
journaling means as said carrier moves in said path of movement,
said second guide means being parallel to and offset from said
first guide means, the engagement of said first guide member with
said first guide means and the simultaneous engagement of said
flexible drive member with said second guide means maintaining the
supporting surface in a generally horizontal attitude as the
carrier moves in a generally vertical portion of said path of
movement.
4. The apparatus of claim 3, wherein said flexible drive members
are chains.
5. The apparatus of claim 3, wherein said second guide means also
includes a guide surface disposed laterally of each flexible member
and disposed to prevent lateral displacement of said flexible
member.
6. The apparatus of claim 3, wherein said carrier is disposed to
move in a generally rectangular path of movement, including an
upper vertical run, an upper horizontal run, a downward vertical
run and a lower horizontal run.
7. The apparatus of claim 6, and including a plurality of first
guide members mounted on the carriage with each first guide member
being offset from said axis, each guide member being constructed
and arranged to engage said first guide means as said carriage is
moved in the respective upward vertical run, the upper horizontal
run, the downward vertical run and the lower horizontal run, only
one of said first guide members being engageable with said first
guide means at any time during movement of said carrier in said
vertical runs.
8. The apparatus of claim 3, wherein said first guide means
includes an elongated first guide track and said first guide member
comprises a roller disposed to ride on said first guide track, and
said second guide means comprises a second elongated guide track.
Description
BACKGROUND OF THE INVENTION
In material handling systems, it is often desired to transfer
articles from one vertical elevation to another, while in other
systems it may be desired to elevate articles over an obstruction,
such as an aisle, and then lower the article back to the original
elevation on the other side of the obstruction.
It is known to utilize material handling systems that incorporate
endless members, such as chains or cables, that are mounted for
endless travel and to attach carriers or trays to the chain. In
systems of this type, articles are introduced onto the carriers as
the carriers move in an upward path and are subsequently discharged
when the carriers are at a higher elevation in the upward path.
However, problems have arisen in attempting to automatically
discharge the articles as the carrier is moving upwardly. In U.S.
Pat. No. 3,664,482 and 4,421,227, the carriers are formed with a
plurality of spaced horizontal fingers which travel upwardly
through spaces in a conveyor to lift an article from the conveyor.
At an elevated position, the carrier is then tilted to a downwardly
inclined position to enable the articles to slide from the carrier
for discharge. However, systems of this type do not insure a
positive discharge, for the articles, depending on their nature,
may not fully slide from the carriers with the result that the
articles may be carried around to the top of the conveying path and
then dumped. As a further disadvantage, systems of this type are
not versatile and can only discharge articles in a single
direction, namely in the direction of tilt of the carrier.
SUMMARY OF THE INVENTION
The invention is directed to an improved high speed material
transfer apparatus in which articles are picked from a conveyor or
pick-up station while the carriers are moving in an upward path of
travel and are deposited on a second conveyor or discharge station
while the carriers are moving in a downward path. In accordance
with the invention, the apparatus includes a frame or supporting
structure and a pair of endless members, such as chains, are
mounted for travel in parallel generally rectangular paths.
At least one carrier is mounted on the chains for free rotation
about a horizontal axis and the carrier has an article supporting
surface that is cantilevered horizontally from the axis. The
carrier preferably is mounted to move in a path that consists of a
first vertical run, an upper horizontal run, a second vertical run
and a lower horizontal run.
Each article to be transferred is fed into the path of travel of
the carrier by a first conveyor and is elevated from the first
conveyor as the carrier moves upwardly in the first vertical run.
Subsequently the article is lowered onto a second conveyor for
discharge as the carrier moves downwardly in the second vertical
run. Each conveyor is provided with parallel transverse gaps or
interruptions and the carrier is formed with a series of parallel
fingers which move through the gaps in the conveyors as the carrier
moves in its path of travel.
The carrier is provided with a plurality of guide members, such as
rollers, which are adapted to engage guide tracks on the supporting
structure, and the guide members and tracks are constructed and
arranged so that the supporting surface of the carrier is
maintained in a horizontal attitude as the carrier moves throughout
its entire path of travel.
The apparatus of the invention enables articles to be automatically
and rapidly transferred from one location to another, preferably at
different vertical elevations.
As the article supporting surface of the carrier is cantilevered
outwardly from the drive chains, three-sided access is achieved for
both feeding and discharge of the articles.
The apparatus is reversible so that articles can either be elevated
from one location to another, or conversely, lowered from a first
location to a second.
The carrier is freely rotatable on the chains and yet the carrier
is maintained in the horizontal attitude throughout the entire path
of travel of the carrier by virtue of the engagement of the guide
members on the carrier with guide tracks on the supporting
structure.
Other objects and advantages will appear in the course of the
following description.
DESCRIPTION OF THE DRAWINGS
The drawings illustrate the best mode presently contemplated in
carrying out the invention.
In the drawings:
FIG. 1 is a perspective view of the apparatus of the invention;
FIG. 2 is a side elevation of the apparatus shown in FIG. 1;
FIG. 3 is a fragmentary horizontal section taken along line 3--3 of
FIG. 2;
FIG. 4 is a perspective view of a carrier;
FIG. 5 is an enlarged fragmentary view of the infeed conveyor;
FIG. 6 is a schematic representation of a modified form of the
invention;
FIG. 7 is a fragmentary plan view of the discharge conveyor;
and
FIG. 8 is a perspective view of a carrier as used in the apparatus
of FIG. 6.
DESCRIPTION OF THE ILLUSTRATED EMBODIMENT
FIGS. 1-5 illustrate an apparatus for transferring articles from
one location to another and as illustrated, the articles are
transferred between two different elevations.
The apparatus, in general, comprises a generally box shaped
vertical frame or supporting structure 1 which houses a transfer
unit 2. Articles 3 to be transferred are fed to the transfer unit 2
by an infeed conveyor 4 and articles are discharged from the
transfer unit to a discharge conveyor 5 which is located at a
higher elevation than the infeed conveyor 4.
The infeed conveyor 4 extends within the frame 1 and includes a
supporting framework 6 including a pair of side channels 7 that are
mounted on legs 8, and as best shown in FIG. 1, are inclined
downwardly in a direction toward the transfer unit 2. A plurality
of rollers 9 are journaled between the channels 7 and the articles
3 will roll downwardly along the rollers 9 to a location within the
frame structure 1.
As shown in FIG. 5, one of the side channels 7 is provided with a
series of spaced interruptions or gaps 10 which enable the articles
3 to be lifted from the conveyor 4, as will be hereinafter
described.
An angle shaped stop bar 11 extends transversely across the
conveyor 4 and serves to stop the articles 3 being fed downwardly
along the conveyor at a predetermined location within the frame
1.
Frame 1 includes a plurality of vertical columns 12 which are
located at the corners of the frame. The lower ends of vertical
columns 12 are connected together by horizontal beams 13 while the
upper ends of the columns 12 are connected by upper horizontal
beams 14. In addition, each pair of columns 12 is connected at
their vertical midpoints by beams 15.
The transfer unit 2 includes a plurality or carriers 16 which are
mounted for travel in a generally rectangular path within frame 1.
Each carrier 16 includes a horizontal bar 17 and a plurality of
parallel spaced fingers 18 extend outwardly from bar 17 and serve
as a support surface to support the article 3. A vertical bar 19
extends upwardly from each end from horizontal bar 17, and an upper
horizontal bar 20 extends from the upper end of each vertical bar
19 is a direction opposite fingers 18.
Carriers 16 are moved in a generally rectangular path by a pair of
endless members or chains 21 which are mounted for travel in
parallel generally rectangular paths composed of a first vertical
run, in upper horizontal run, a second vertical run and a lower
horizontal run. The ends of bar 17 are journalled on aligned pins
of chains 21 so that the carrier can freely rotate about a
horizontal axis.
Each chain is engaged with a drive sprocket 22 and extends around
an upper guide wheel 23 as well as around lower guide wheels 24 and
25.
Chains 21 are guided for vertical movement at one end of the frame
1 by a pair of spaced angle shaped guides 26, and similarly the
opposite vertical runs of the chains 21 are guided in angle shaped
guides 27 located at the opposite end of the frame, Guides 26 and
27 are connected to supporting structure 1 through suitable
brackets.
To facilitate movement of the chains in the guides 26 and 27 the
inner surfaces of the angle-shaped guides can be lined with strips
of a material having a low coefficient of friction, such as nylon,
not shown.
In addition, a plurality of spacer rods 29 extend horizontally
between corresponding portions or the chains 21 and prevent the
chains from moving inwardly toward each other during their
travel.
The chains 21 are driven by a motor 30 mounted on a platform 31
that is offset from the upper end of frame 1. The drive shaft of
motor 30 operates through a gear box 32 to drive shaft 33 which
extends between opposite ends of the frame. Shaft 33 is journaled
for rotation in a group of bearings 34 which are mounted on
platform 31.
As shown in FIG. 3, the ends of shaft 34 carry sprockets 35 and
each sprocket 35 is connected by a chain 36 to a sprocket 37
secured to shaft 38. Each shaft 38 is journaled for rotation in
bearings 39 which are mounted on the upper beam extension 14a. Each
shaft 38 carries the respective drive sprocket 22. With this
construction, operation of motor 30 acts to drive the sprockets 22
to thereby move the chains 21 in their respective paths of
travel.
The guide wheels 23, 24 and 25 for each chain 21 are mounted n a
shaft 40 which is journaled within a bearing 41 mounted on the
beams 13 and 14 of frame 1.
As the chains 21 are driven in their endless generally rectangular
path of travel, carriers 16 correspondingly move in a rectangular
path of travel. To maintain the fingers 18 in a horizontal attitude
as the carriers move in the path of travel, a plurality of guide
members or rollers are mounted on each carrier 16. More
specifically, a roller 42 is journaled on the lower end of each
vertical bar 19 and faces inwardly of the carrier toward fingers
18, while a pair of rollers 43 and 44 are journaled on the ends of
each horizontal bar 20 and face outwardly of the carrier 16. In
addition, a guide block 45 made of nylon or the like, is secured to
the lower surface of the outer end of one of the fingers 18 and
projects downwardly from the finger.
Guides 42-45 are designed to ride against fixed guide tracks on
frame 1 as the carrier 16 moves in its path of travel. As best
shown in FIGS. 2 and 3, a pair of vertical, angle-shaped guide
tracks 46 are mounted in spaced relation at one end of the
supporting structure while a pair of similar vertical guide tracks
47 are mounted at the opposite end of the structure. Guide tracks
46 and 47 are connected to frame 1 through suitable brackets.
A pair of upper guide tracks 49 are mounted through bracket 50 to
frame 1 and each includes a lower curved end 52 which is offset
from the upper end of the respective vertical guide track 46. A
pair of second upper curved guide tracks 53 extend upwardly from
the upper ends of the respective vertical guide track 47, as shown
in FIG. 2. At the lower end of frame 1, a single guide track 54
having an upwardly curved outer end is mounted through brackets 55
to the frame, and track 54 is positioned to be engaged by guide
block 45 on finger 18 of carrier 16 as the carrier travels in its
lower horizontal run. Guide tracks 47 are mounted in position to be
contacted by rollers 42 as carrier 16 travels in a first vertical
run, while rollers 44 with ride against tracks 49 as the carrier
moves in an upper horizontal run. As the carrier travels downwardly
in its second vertical run, rollers 43 will ride on tracks 46, and
as the carrier approaches its lower horizontal run rollers 43 will
ride on the lower curved end 46a of tracks 46 until guide block 45
engages guide track 54. Thus, the engagement of guides 42-45 with
the guide tracks will maintain the supporting fingers 18 of carrier
16 in a horizontal attitude at all times during the travel of the
carrier.
Discharge conveyor 5 is located at a higher level than feed
conveyor 4 and extends outwardly from the upper end of supporting
structure 1 in the path of travel of the carriers 16 so that the
carriers can lower the articles onto the discharge conveyor.
Discharge conveyor 5 is constructed similar to conveyor 4 and
includes a framework 56 which is connected to frame 1. Framework 56
supports a pair of spaced parallel channels 57 and a series of
rollers 58 are journaled between the channels and act to support
the article 3 in discharge. As in the case of feed conveyor 4, one
of the channels 57 is provided with gaps 59 which permit the
fingers 18 of carriers 16 to pass through the discharge
conveyor.
In operation, the articles 3 are fed to track transfer unit 2 on
feed conveyor 4. As the conveyor 4 is inclined downwardly, the
articles will move by gravity along the conveyor and be stopped in
position by engagement with the stop bar 11.
Through operation of motor 30, each carrier 16 will move in a
generally rectangular path of travel and as a carrier moves
upwardly in a vertical run, fingers 18 of the carrier will pass
through the gaps 10 in feed conveyor 4 and lift the article 3 from
the conveyor. As previously noted, the carrier 16 is mounted for
free rotation between chains 21 and as the carrier 16 moves
upwardly in the vertical run, engagement of the rollers 42 with the
guide tracks 46, in cooperation with engagement of chains 21 with
guides 26, will prevent tilting of the carrier and maintain the
fingers 18 in a generally horizontal attitude
When the carrier approaches the upper end of the vertical run, the
rollers 44 will move along into engagement with the curved portions
52 of guide tracks 49 and at this time, the rollers 42 move out of
engagement with guide tracks 46. As the carrier 16 travels in its
upper horizontal run, rollers 44 will engage the straight sections
of upper guide tracks 49.
At the end of the upper horizontal run, the carrier 16 will then
move downwardly in a vertical run and the rollers 44 will follow
the curved portions 53 of the guide tracks as the carrier moves
into the vertical run. As the carrier moves downwardly, the rollers
43 will ride against the vertical guide tracks 47 and in
combination with the engagement of chains 21 with guides 27 will
thereby maintain the fingers 18 in a horizontal attitude. As the
carrier continues its downward movement, the fingers 18 will move
downwardly through the gaps 54 in the discharge conveyor 5, thereby
depositing the article 3 on the discharge conveyor. As previously
noted, the discharge conveyor 5 can be mounted at an angle, so that
the article will travel downwardly by gravity on the discharge
conveyor to a discharge side.
When carrier 16 approaches the lower end of the vertical run, the
guide block 45 will engage the outer curved end 60 of lower track
54 and will act to maintain the fingers 18 of the carrier in a
horizontal attitude as the carrier travels in the lower horizontal
run.
The fingers 18 of carrier 16, which define the supporting surface
for the article 3, are cantilevered from the shaft 17 and the
engagement of the guide members 42-45 with the guide tracks will
maintain the fingers in a horizontal attitude regardless of the
weight of the articles 3, or the position or distribution of the
load on the fingers.
The guide tracks which are engaged by the guides 42-45 are fixed to
the supporting structure or frame and are separate from the chains
21, so that with a heavy load there is no tendency to deflect the
chains.
FIGS. 6-8 show, in schematic form, a modified form of the apparatus
in which a plurality of carriers 61, similar to carriers 16 of the
first embodiment, travel in a generally rectangular path of travel,
including a first vertical run, an upper horizontal run, a second
vertical run, and a lower horizontal run. Each carrier 61 is
connected to a pair of drive chains in the manner previously
described.
Each carrier 61 includes a support member or bar 62, the ends of
which are journalled on the drive chains, as in the manner
previously described. A plurality of parallel fingers 63 extend
outwardly from each bar 62 and constitute a cantilevered support
surface to support an article 3.
As best shown in FIG. 8, a plate 64 is mounted on each end of bar
62 and each plate carries a group of rollers 65, 66 and 67. As
shown in the drawings, rollers 65 and 66 are journalled on the
upper end of the plate and extend outwardly from the plate, while
roller 67 is mounted for rotation on the lower end of each plate
and extends inwardly of the carrier.
As in the case of the first embodiment, a pad 68, made of nylon, or
the like, is secured to the outer end of one of the fingers 63 and
projects downwardly.
To guide the carriers 61 in their rectangular path of travel, a
pair of vertical guide rails 69 and 70 are mounted at each end of
the frame, while a pair of top rails 71 and 72 are located at the
upper and lower ends, respectively, of the frame. In addition,
curved corner guides are located at the corners of the path of
travel. More particularly, curved guide 73 extends upwardly and
inwardly from the upper end of each guide rail 69, while corner
guide 74 serves to connect the end of upper guide rail 71 with the
upper end of vertical guide rail 70. Curved guide 75 is mounted to
each lower guide rail 72, while curved guides 76 are mounted on the
frame adjacent the lower ends of the vertical guide rails 69.
As shown schematically in FIG. 6, as the carrier 61 moves upwardly
in its first vertical run, the rollers 67 will engage the vertical
guide rails 69 and the drive chains will engage the chain guides,
as previously described, to maintain the fingers 63 in a horizontal
attitude. As the carrier 61 reaches the upper end of the vertical
run, the rollers 67 will move along the curved corner guides 73 and
the upper roller 65 will then engage the upper guide 71 to again
maintain the fingers in a horizontal position, as the carrier moves
in its upper horizontal run.
As the carrier approaches the downstream end of the upper
horizontal run, the rollers 66 will engage the curved corner guide
74 and the rollers 66 will then move onto the vertical guide rail
70 and the drive chains will engage the chain guides to maintain
the fingers 63 in a horizontal position as the carrier moves in its
downward vertical run.
When approaching the lower end of guide rails 70, the rollers 67
will engage the curved guide 75 to guide the carrier around the
corner, and the pad 68 will then engage the lower horizontal guide
rail 72 to maintain the carrier in a horizontal attitude as it
moves in its lower horizontal run. As the carrier approaches the
end of its lower horizontal run, the roller 65 will engage the
curved corner guides 76, which guides the carrier around the corner
and the rollers 65 will then engage the vertical guide rails 69 to
complete the path of travel.
The carrier 61 has an advantage over the weldment as shown in the
first embodiment, for a group or batch of plates 64 can be cut and
holes drilled to receive the rollers, thus providing more precise
positioning for the guide rollers and eliminating the welding
operations.
In the embodiment of FIGS. 6-8, an article 3 is picked up on the
carrier 61, as the carrier moves in its first vertical run, and the
article is then deposited on a second conveyor as it moves
downwardly in the second vertical run. The feeding of the articles
to the carriers is not illustrated in FIGS. 6-8 and can take the
same form as that previously described with respect to FIGS. 1-5.
However, FIGS. 6-8 illustrate a modified form of discharge of the
articles 3. In this connection, a pair of vertically spaced
discharge conveyors 77 and 78 are mounted alongside the downwardly
path of travel of the carriers 1 and each conveyor 77,78 is
supported through a support structure 79 and 80, respectively, from
a floor or foundation 81,82. In practice, the two floors 81 and 82
can constitute different floors of a building, or can constitute a
main floor and a mezzanine.
Each conveyor 77,78 includes a main conveyor section 83 and a
pivotable end section 84, which is mounted for pivoting movement
with respect to the main section 83 from an operating position,
where it forms an extension to conveyor section 83, and a
downwardly hanging inoperative or pendant position.
Each main conveyor section 83 includes a pair of side rails 85
which are interconnected by shafts 86 and a plurality of wheels or
rollers 87 are mounted on each shaft in staggered or offset
relation.
Each end conveyor section 84 is formed with a series of generally
parallel spaced fingers 88, which are connected to an end bar 89
that is pivoted to the side rails of section 83. Rollers 90 are
mounted for rotation on each finger 88 and the rollers are spaced
sufficiently from the next adjacent finger to provide gaps 91
through which the fingers 63 of the carrier 61 can pass.
To move each conveyor section 84 between the operating and
inoperative positions, a cylinder unit 92 is employed. Cylinder
unit 92 includes a fluid cylinder 93, such as a pneumatic or
hydraulic cylinder, which is pivotally connected to the supports
79,80 and the piston rod 94 of cylinder 93 is pivotally connected
to the respective section 84. By extending the piston rods 94, the
sections 84 can be pivoted to the horizontal or extended position.
Conversely by retracting the piston rods, the sections will be
pivoted downwardly to the inoperative or pendant position.
By selectively moving either conveyor section 84 to its extended
position, the articles 3 being carried by the carriers 61 will be
deposited on the extended section 84, as the carrier moves in its
downward path of travel. As the conveyors 77 and 78 are slightly
inclined, the articles deposited on the conveyors will travel
downwardly by gravity to a discharge site. Alternately, the
conveyors 77 and 78 can be power operated. With this construction,
articles can be selectively delivered to various levels of a
building.
As the carriers 16,61 are cantilevered, they provide three-sided
access for feeding and delivery. More specifically, FIGS. 1-5 show
a system in which the discharge of the articles is perpendicular to
the cantilivered fingers of the carrier 16, while FIGS. 6-8 show a
system in which the discharge is parallel to the cantilivered
fingers of the carrier. Thus, the apparatus of the invention
provides great versatility in the feeding and delivery of articles
from the system.
While the invention can be used to elevate articles from a lower
level to an upper level, it can also be employed to lower articles
or to move articles upwardly, then horizontally over an obstruction
and then downwardly to a discharge site. Further, while the
drawings have shown the carriers 16 moving in a generally
rectangular path, it is contemplated that the path of movement can
take various configurations, with the carriers moving horizontally,
vertically, or at an angle to the horizontal or vertical.
Similarly, other endless drive members, can be substituted for
chains 21 to drive the carriers 16,61 and other types of guides can
be substituted for the rollers 42-44 and 65-67.
Various modes of carrying out the invention are contemplated as
being within the scope of the following claims particularly
pointing out and distinctly claiming the subject matter which is
regarded as the invention.
* * * * *